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Fire safety in roofing is no longer optional—it’s a critical compliance and risk-management requirement. In the UK and Ireland, BRoof(t4) certification under BS EN 13501-5 is the gold standard for external fire performance in flat and liquid roofing systems.
Whether you’re a roofing contractor, architect, or building owner, choosing a BRoof(t4)-certified liquid roofing system helps you:
Looking for a compliant solution? Explore our TriRoof MultiFlex system below.
BRoof(t4) is the highest classification for resistance to external fire exposure in roofing systems. It evaluates how a roof performs under realistic fire scenarios, including:
To achieve BRoof(t4), a roofing system must:
Following updates to Approved Document B (2019)—influenced by the Grenfell Tower tragedy and Hackitt Review—the UK moved from BS 476-3 to the European standard BS EN 13501-5.
The Test 4 method (CEN/TS 1187) was specifically chosen because it replicates UK weather and fire conditions, making it the most relevant and stringent benchmark.
Testing is conducted by approved organisations such as the British Board of Agrément (BBA).
A system only passes if it prevents fire spread and penetration under all conditions.
Not universally required—but in practice, architects, insurers, and building control often expect it for compliance with Part B.
Yes. Many liquid-applied systems allow overlays, upgrading fire performance without full roof replacement.
Certification remains valid as long as the product formulation and installation method don’t change, supported by ongoing audits.
t1–t3 = regional/less stringent methods
t4 = most demanding and UK-preferred standard
Before specifying a system, make sure it:
If you’re looking for a high-performance liquid roofing system, TriRoof MultiFlex delivers:
✅ Full BRoof(t4) compliance
✅ Excellent durability and flexibility
✅ Suitable for refurbishment and new builds
✅ Fast and efficient application
BRoof(t4) is more than a certification—it’s a critical safeguard for building safety, compliance, and long-term performance.
If you’re specifying or installing a roofing system in today’s regulatory environment, BRoof(t4) should be your baseline standard—not an optional extra.
Tricel and ECMS restored a WWII-era commercial flat roof at IWM Duxford using TriRoof HPX System, delivered ahead of schedule with a 20-year guarantee.
Learn how BRoof(t4) certification ensures fire safety and compliance for liquid roofing systems, benefiting both contractors and end users.
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